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Hello, my name is***** thing left is head gasket or radiator. You can do a block test and cooling system pressure test, if it fails either test then replace the head gasket. If it passes the tests then replace the radiator. It sounds more like a radiator problem since it doesn't completely overheat. Let me know if you have more questions, thanks.
It should be one of the two, there is nothing else that would cause overheating while driving. Head gasket doesn't always cause misfire or oil contamination. Let me know if you have more questions, thanks.